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Results in Physics

A practical quantum bit commitment protocol

S. Arash Sheikholeslam, Thomas Aaron Gulliver

Published Jan 1, 2012• 2 citations
Publisher

Abstract

In this paper, we introduce a new quantum bit commitment protocol which is secure against entanglement attacks. A general cheating strategy is examined and shown to be practically ineffective against the proposed approach.
DOI
10.1016/j.rinp.2012.07.002

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Comment on “Cheat-sensitive commitment of a classical bit coded in a block of m×n round-trip qubits”

Guang Ping He

We found a cheating strategy for the quantum cheat-sensitive bit commitment protocol proposed in Phys. Rev. A 84, 022308 (2011). It enables the receiver of the commitment to cheat with a probability not less than $1/2$, no matter what values are chosen for the security parameters in the protocol. More interestingly, the probability for successful cheating will rise as the number $n$ of the particles used in the protocol increases and will be arbitrarily close to $100%$ in the limit $n\ensuremath{\rightarrow}\ensuremath{\infty}$.

Physical Review A•May 5, 2014•2 citations
In classical cryptography, the bit commitment scheme is one of the most important primitives. We review the state of the art of bit commitment protocols, emphasizing its main achievements and applications. Next, we present a practical quantum bit commitment scheme, whose security relies on current technological limitations, such as the lack of long-term stable quantum memories. We demonstrate the feasibility of our practical quantum bit commitment protocol and that it can be securely implemented with nowadays technology.
We found a cheating strategy for the quantum cheat-sensitive bit commitment protocol proposed in Phys. Rev. A 84, 022308 (2011). It enables the receiver of the commitment to cheat with a probability not less than 1/21/21/2, no matter what values are chosen for the security parameters in the protocol. More interestingly, the probability for successful cheating will rise as the number nnn of the particles used in the protocol increases and will be arbitrarily close to 100100%100 in the limit $n\ensuremath{\rightarrow}\ensuremath{\infty}$.